README.md

---
license: apache-2.0
tags:
- dino
- vision
- onnx
- dinov2
pipeline_tag: feature-extraction
---

# ONNX Vision Transformer (small-sized model) trained using DINOv2

Vision Transformer (ViT) model trained using the DINOv2 method. It was introduced in the paper [DINOv2: Learning Robust Visual Features without Supervision](https://arxiv.org/abs/2304.07193) by Oquab et al. and first released in [this repository](https://github.com/facebookresearch/dinov2). 
The model has been exported to ONNX format.

## Model description

The Vision Transformer (ViT) is a transformer encoder model (BERT-like) pretrained on a large collection of images in a self-supervised fashion. 

Images are presented to the model as a sequence of fixed-size patches, which are linearly embedded. One also adds a [CLS] token to the beginning of a sequence to use it for classification tasks. One also adds absolute position embeddings before feeding the sequence to the layers of the Transformer encoder.

Note that this model does not include any fine-tuned heads. 

By pre-training the model, it learns an inner representation of images that can then be used to extract features useful for downstream tasks: if you have a dataset of labeled images for instance, you can train a standard classifier by placing a linear layer on top of the pre-trained encoder. One typically places a linear layer on top of the [CLS] token, as the last hidden state of this token can be seen as a representation of an entire image.

**Model Properties**:

* Input name: input
* Output name: output
* Input size: 224x224
* Output size: 384
  
## Intended uses & limitations

You can use the ONNX model for feature extraction using ONNXRuntime.

### How to use

Models can be executed using ONNXRuntime. Example usage can be found in the [dinov2_onnx repository](https://github.com/sefaburakokcu/dinov2_onnx).

```bash
git clone git@github.com:sefaburakokcu/dinov2_onnx.git
cd dinov2_onnx

python onnx_inference.py
```

Optional arguments:
- `--onnx_model`: Path to the ONNX model file (default: `./dinov2_vits14.onnx`).
- `--image_folder`: Path to the folder containing input images (default: `./inputs/`).

### BibTeX entry and citation info

```bibtex
misc{oquab2023dinov2,
      title={DINOv2: Learning Robust Visual Features without Supervision}, 
      author={Maxime Oquab and Timothée Darcet and Théo Moutakanni and Huy Vo and Marc Szafraniec and Vasil Khalidov and Pierre Fernandez and Daniel Haziza and Francisco Massa and Alaaeldin El-Nouby and Mahmoud Assran and Nicolas Ballas and Wojciech Galuba and Russell Howes and Po-Yao Huang and Shang-Wen Li and Ishan Misra and Michael Rabbat and Vasu Sharma and Gabriel Synnaeve and Hu Xu and Hervé Jegou and Julien Mairal and Patrick Labatut and Armand Joulin and Piotr Bojanowski},
      year={2023},
      eprint={2304.07193},
      archivePrefix={arXiv},
      primaryClass={cs.CV}
}
```